102221001221 has 4 divisors (see below), whose sum is σ = 103233090444. Its totient is φ = 101208912000.

The previous prime is 102221001209. The next prime is 102221001229. The reversal of 102221001221 is 122100122201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50316770596 + 51904230625 = 224314^2 + 227825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102221001221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102221001196 and 102221001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102221001229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506044460 + ... + 506044661.

It is an arithmetic number, because the mean of its divisors is an integer number (25808272611).

Almost surely, 2^102221001221 is an apocalyptic number.

It is an amenable number.

102221001221 is a deficient number, since it is larger than the sum of its proper divisors (1012089223).

102221001221 is a wasteful number, since it uses less digits than its factorization.

102221001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012089222.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 102221001221 its reverse (122100122201), we get a palindrome (224321123422).

The spelling of 102221001221 in words is "one hundred two billion, two hundred twenty-one million, one thousand, two hundred twenty-one".